While it is true that Downfall parodies are based mainly on Downfall, developments in the meme (such as actor parodies) have seen the inclusion of various other films and TV series in the parodies. These films and series used in parodies are usually famous ones (e.g Star Wars, Star Trek, Alien, etc). Some of these films become famous enough in parodies that new sprouted around them (e.g. Tukhachevsky, Conspiracy Marshal became the basis for Stalin Parodies.)